76 TinyPID
76 : TinyPID
- Author: Aidan Medcalf
- Description: Tiny PID controller with SPI configuration channel, SPI ADC and DAC driver
- GitHub repository
- Clock: 1 Hz
How it works
TinyPID reads from a shift register, calculates error and PID values, and writes to a shift register. All parameters of this process are configurable.
How to test
Shift in config, then shift in PV input and see what happens. There are three bytes of configuration (setpoint, kp, ki), which are zero on startup.
External hardware
One shift register / ADC for PV read, one shift register / DAC for stimulus output.
IO
| # | Input | Output |
|---|---|---|
| 0 | clock | pv_in_clk |
| 1 | reset | pv_in_cs |
| 2 | out_clk | |
| 3 | cfg_clk | out_mosi |
| 4 | cfg_mosi | out_cs |
| 5 | ||
| 6 | cfg_cs | |
| 7 | pv_in_miso |